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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: Removing the input coupling caps?? posted by Chip647 on August 20, 2014 at 05:06:39:
The 0.1 is not intended to be a filter, although it does create a slight rolloff in the 10Hz region. Its actual purpose is to block any DC that's present at the source. The 33pF/470k combination is a low pass filter to attenuate RF (broadcast stations, ham radio operators, etc.) It's a little too close to the audio band for my taste, and I would remove it. A 200kHz LC low pass would be a better choice, but only if needed in order to solve a problem in a particular situation.
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Follow Ups
- Input Cap Functions - Triode_Kingdom 08:37:43 08/20/14 (1)
- RE: Input Cap Functions - Chip647 12:29:39 08/20/14 (0)
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